Question

Find the area of the regular polygon. round your answer to the nearest tenth.

A:
172.2 in.^2

B:
50.0 in.^2

C:
84.4 in.^2

D:
344.3 in.^2

Answer 1

Area = 1/4√(5(5+2√5))a^2. a is the length of a side. If you plug in 10 as a, you get approximately 172, which is about the same as the 1st option .